Hybrids of the Siberian Sturgeon

Chebanov, Mikhail; Podushka, Sergei; Рачек, Е. И.; Amvrosov, Dmitry; Merkulov, Yan

doi:10.1007/978-3-319-61676-6_14

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…This was due to the widespread cultivation of these species in their native range and many areas worldwide, including Vietnam (Chebanov & Williot, 2018; Williot et al, 2009). Moreover, seeds of these sturgeons have been artificially produced at hatcheries and supplied to aquaculture farms (Chebanov et al, 2018; Chebanov & Billard, 2001; FAO, 2011a; 2011b). Acipenser baerii also had a high score for the question pertaining to invasion elsewhere, because this species established in the Syr Darya basin of Uzbekistan (FishBase, 2022).…”

Section: Discussionmentioning

confidence: 99%

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Ecological risk screening of sturgeons introduced for aquaculture in Vietnam

Bui

2022

Fisheries Management Eco

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Introduced non-native species are major threats to global biodiversity. In Vietnam, non-native sturgeons have been introduced and widely cultured, but their potential impacts on native aquatic ecosystems have not been screened. Therefore, this study aimed to investigate potential risks that sturgeons likely pose in Vietnam by using the Aquatic Species Invasiveness Screening Kit (AS-ISK) and interpret outcomes within a management context. Results showed that the Basic Risk Assessment (BRA) scores were 9.0-13.5 and the combined BRA and Climate Change Assessment (BRA+CCA) scores were 5.0-9.5. All five sturgeon species and two hybrid sturgeons cultured in Vietnam were classified as medium risk of invasiveness. Central concerns relating to introduced sturgeons included transmission of new infectious disease agents, and predation and competition for food with native species, especially threatened species. Controlling pathways of sturgeon importation through quarantine processes and preventing sturgeon from escaping into natural waterways are required if sturgeon aquaculture is to be sustainable, native species are to be protected, and biodiversity is to be conserved over the long term.

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Section: Discussionmentioning

confidence: 99%

“…Selective breeding and crossbreeding of sturgeon species (e.g. A. gueldenstaedtii × A. baerii and H. huso × A. ruthenus ) also create hybrids that grow faster and can adapt to unusual environmental conditions (Chebanov et al, 2018; Chebanov & Billard, 2001).…”

Section: Discussionmentioning

confidence: 99%

Ecological risk screening of sturgeons introduced for aquaculture in Vietnam

Bui

2022

Fisheries Management Eco

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“…As a result, three ploidy levels were revealed in these fishes: 1) species with about 120 chromosomes; 2) species with 250–270 chromosomes; 3) one species with about 370 chromosomes (see Fontana et al., 2008; Vasil′ev, 2009). Species with the same level of ploidy often produce normal fertile hybrid offspring that is capable of successful breeding (for example, bester and Chinese hybrid); while hybridization of species with different ploidy levels leads to completely sterile or sub‐fertile progeny (see Bronzi et al., 1999; Burtsev, 1962; Chebanov et al, 2018; Nikoljukin, 1972; Podushka, 2004; Rachek, Svirskii, Skirin, & Lipin, 2010). For example, completely sterile progeny was obtained by hybridization of beluga (~120 chromosomes) with Russian sturgeon (~250 chromosomes) (Nikoljukin, 1972).…”

Section: Introductionmentioning

confidence: 99%

Fertility of females of sturgeon hybrids obtained from species with different levels of ploidy ( Acipenser ruthenus and A. dauricus ) and their cloning

Васильев

Rachek²,

Amvrosov³

et al. 2021

J Appl Ichthyol

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Main purpose of this work is the identification of females of artificial sturgeon hybrids capable to produce unreduced oocytes. The importance of this task is due to the ability to receive clonal all‐female lines. Experiments were performed on the previously obtained reciprocal hybrids of sterlet, Acipenser ruthenus (S) with ~120 chromosomes and kaluga, Acipenser dauricus (K) with ~260 chromosomes. Karyotypes of backcross hybrids of (S × K) female (obtained by crossing sterlet female with kaluga male) and sterlet male included 180 – 190 chromosomes. This means that (S × K) female produced eggs with ~125 chromosomes and its karyotype consisted of ~250 chromosomes. This number was confirmed by a comparative analysis of erythrocyte size in this female and species with different ploidy. Karyotype with ~250 chromosomes can occur in (S x K) female only as a result of fertilization of a diploid sterlet egg (120 chromosomes) with kaluga haploid sperm (~130 chromosomes). Eggs of hybrid fertile (S × K) female, inseminated with inactivated sperm of Amur sturgeon and sterlet, developed into viable gynogenetic offspring, confirmed by the analysis of five microsatellite loci in this progeny, (S x K) female, and males used for UV‐inactivated sperm. These data allow us to propose a method for obtaining fertile females of sturgeon hybrids from species with different ploidy. For this, experimentally obtained diploidized eggs from diploid 120‐chromosome species must be fertilized by 250–270‐chromosome male. Karyotypes of backcross hybrids of (K × S) female (obtained by crossing kaluga female with sterlet male) and sterlet male included ~250 chromosomes and hybrids of this female with kaluga male had ~320 chromosomes. These results proved an ability of hybrid (K × S) female to produce unreduced eggs, resulting in triploid backcrosses. The absence of reduction during egg development is well known in clonal forms (species) of vertebrates, which are of hybrid origin, and in artificially created fish hybrids. However, this has not been reported previously for sturgeons. Insemination of eggs of (K × S) female with UV‐inactivated sperm of sterlet and Amur sturgeon led to offspring generation for which the genetic identity to their mother was proved using microsatellite analysis. That is, clonal inheritance was observed. These results suggest the possibility of developing a technology to produce all‐female offspring. Artificial production of clonal lines in hybrid vertebrates can be also considered as experimental reproduction of the first stages of reticular speciation in nature.

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